'10 Mercedes C300, Mix of Mobil 0w40 and Castrol 0w30, 6559 Miles

[SnowmanCO]

First UOA on this car. 1 Year on oil, and 65641 Miles on vehicle. 5 quarts Mobile 0w40, and 3 quarts Castrol 0w30

 

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That's an interesting mix, looks good though.

 

[SnowmanCO]

I had a 3 quarts of Castrol 0w30 in my stash when I purchased the car, and then got the Mobil 0w40 5 quart container at Walmart to do my first oil change. Both comply with the Mercedes 229.5 spec, so it seemed OK. Since then, I purchased a few jugs of Castrol 0w40 for the next few changes, which is in the sump currently. Iron seems slightly high to me, but it appears to be the norm on this engine.